Reevaluation of Cl / HCO 3 Exchange in Cultured Bovine Corneal Endothelial Cells

Reevaluation of Cl / HCO 3 Exchange in Cultured Bovine Corneal Endothelial Cells
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培养牛角膜内皮细胞中 Cl / HCO 3 交换的重新评估

DOI:
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发表时间:
2005
期刊:
影响因子:
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通讯作者:
S. P. Srinivas
S. P. Srinivas
中科院分区:
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文献类型:
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作者:
J. Bonanno;G. Yi;Xiaodong Rang;S. P. Srinivas

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结果。从根尖和基底侧面去除氯离子导致细胞碱化(顶侧,0.07个pH单位;基底侧面,0.06个pH单位;两侧,0.20个pH单位)。在顶端应用阴离子交换抑制剂M-H2-4,4‘-diisothiocyanatodihydrostilbene-2,2’-disulfonic酸(DIDS)100u时,先是碱化(0.02pH单位),然后是酸化(-0.05pH单位),而基侧的H_2DDS引起大量酸化(-0.16pH单位)。在没有Na的情况下,从顶侧去除CP会导致短暂的碱化(0.03个pH单位),然后返回基线;从基底侧去除Cl2~-会引起很小的酸化(-0.03)。在无Na的Ringer中,顶端的H_2DID产生了短暂的碱化(0.02个pH单位),而基底侧暴露则没有影响。已知的氯离子通道阻滞剂5-硝基-2-(3-苯丙氨基)苯甲酸(NPPB)、TV-苯基邻氨基苯甲酸(DPC)和尼氟米酸(50-200PTM)可引起对照林格细胞酸化。尼氟米酸使Em超极化,并抑制除氯后的去极化。Western印迹分析未能检测到培养的BCECs中AE2的表达。然而,新鲜的BCEC产生了微量的反应。
RESULTS. Cl~ removal from apical and basolateral surfaces produced cellular alkalinization (apical side, 0.07 pH units; basolateral side, 0.06 pH units; both sides, 0.20 pH units). Application of 100 /u,M H2-4,4'-diisothiocyanatodihydrostilbene-2,2'-disulfonic acid (DIDS), an anion exchange inhibitor, on the apical side produced an alkalinization (0.02 pH units) followed by acidification (—0.05 pH units), whereas basolateral H2DIDS caused a substantial acidification (—0.16 pH units). In the absence of Na, CP removal from the apical side caused a transient alkalinization (0.03 pH units) followed by a return to baseline; Cl~ removal from the basolateral side caused a small (—0.03) acidification. In Na-free Ringer, apical H2DIDS produced a transient alkalinization (0.02 pH units), whereas basolateral exposure had no effect. 5-Nitro-2-(3-phenylpropylamino)benzoic acid (NPPB), TV-phenylanthranilic acid (DPC), and niflumic acid (50-200 ptM), known Cl~ channel blockers, produced cellular acidification in control Ringer. Niflumic acid hyperpolarized Em and inhibited depolarization after Cl~ removal. Western blot analysis failed to detect AE2 expression in cultured BCECs. However, fresh BCECs produced a trace response.
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